In the lab, a reaction involving 624 g of O2 occurred. How many moles of Fe2O3
were produced?

Determine the empirical formula of a compound containing 40.6 grams of carbon, 5.1 grams of hydrogen, and 54.2 grams of oxygen. in an experiment, the molar mass of the compound was determined to be 118.084 g/mol. what is the molecular formula of the compound? for both questions, show your work or explain how you determined the formulas by giving specific values used in calculations.

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

8) warming your hands by a fire is an example if which heat transfer? a. conduction b. convection c. radiation d. none of these